负压称量室是一种用于制药、微生物研究和科学实验等场所专用的局部净化保护装置，在操作区域提供垂直气流，大部分空气通过回风道在工作区域循环，小部分排出至设备区域以外，形成负压工作区，保护洁净操作同时防止交叉污染。

Negative pressure weighing booth is a kind of used for pharmaceuticals, microbial research and scientific experiments such as special local purification protection device, provide vertical airflow in the operating area, most of the air through the return air duct in the work area circulation, small discharge to equipment area, form a negative pressure workspace, protect clean operation and prevent cross contamination.

负压称量罩为模块化结构设计，由304不锈钢一体成型制作而成，平整光滑，易于清洁；通过工作模块，回风模块，静压送风模块，电气控制模块，初中高效过滤器等部件组装而成。负压称量罩由PLC集中控制，可在HMI上实现风机启停、调速、照明开关、过滤器压差监测等功能，并具备报警，历史记录，审计追踪（选）功能，可通过通讯外接罩内操作设备或集中监控系统。

The negative pressure weighing booth is modular structure design, made of 304 stainless steel integrated molding, smooth and easy to clean; It is assembled by working module, return air module, static pressure supply air module, electrical control module, high efficiency filter and other components. The negative pressure weighing booth is centrally controlled by PLC, which can realize fan start and stop, speed regulation, lighting switch, filter differential pressure monitoring and other functions on the HMI, and has alarm, history recording, audit trail (optional) functions, and can operate equipment or centralized monitoring system through communication external cover.